Question

the rhythmic expansion and contraction of dash is called heart beat​

Answer 1

The contraction of heart is called cardiac systole, whereas expansion or relaxation is called cardiac diastole. We can altogether call it a cardiac cycle. The rhythmic contraction and expansion of the heart is a Cardiac cycle.

Answer 2

Answer:

Answer Verified. Hint: The contraction of heart is called cardiac systole, whereas expansion or relaxation is called cardiac diastole. We can altogether call it a cardiac cycle. Complete answer: The rhythmic contraction and expansion of the heart is a Cardiac cycle.